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Triumph keeps blowing fuses after tri spark install.

3997 Views 8 Replies 4 Participants Last post by  Tony the torch
I posted this on the britbike board too, figured maybe one of you could help.

Howdy all, I've got a 71 bonneville I installed a tri-spark classic twin ignition with their dual 6v coils, and their 3-phase alternator/voltage regulator kit. Spendy but the way I wanted to go.

I finally got around to putting this bike back together, and it ran fine before when it ran. So now I've got everything wired up the right way, double checked the diagrams they gave me for the new setup, and went through the static timing procedure. Verified TDC and 38 deg. before with the crankshaft notches, and also through the spark plug hole.

It started up on the first kick, and I didn't even have to kick it very hard, but the bike only ran for a few seconds before I blew a fuse(looks like the original Lucas fuse). The motor sounded great those two seconds as well. I'm thinking I have a short somewhere but I'm not sure how to go about finding it, electrics are not my specialty at all. I've got some new fuses, 15A and 20A, but don't want to try starting again until I'm pretty sure I won't damage the new ignition. I'm hoping the symptoms might be telling of a problem.

Here's some pictures of the wiring...The three alternator wires go to any of the three yellow wires of the voltage regulator, and the black and red wires from the voltage regulator go to their respective battery terminals, those are the extra wires on the terminals.

The jumper wire I have between the coils is brown and white, I just scavenged that from some spare wires I had. It's not connected to anything else. There's also a red wire connecting the white/black and yellow/black, again, just what I had on hand.

The only wires that aren't connected are two blue/brown wires with a single connector, a blue brown wire with a single connector, and two red wires with a single connector, hopefully you can see this.

As it is, it will run for maybe five seconds with a fuse in before it blows. I even took the seat off in case it was shorting out to the pan, and it did the same thing again. I have 15A and 20A fuses.

Any help would be greatly appreciated, I really want to ride this thing again before I have to put it away for winter.

And here's a link to the tri-spark website for their installation instructions and troubleshooting guide.


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If you're still running AMALS, verify that the slide is closing all the way. Whether it is a cable issue, crud in the carb body causing it to stick, or a warped body, if it doesn't close all the way it will "idle"way high like that. Do you have the choke installed? If not make sure where the choke cable used to go is sealed well. Check for intake leaks by spraying carb cleaner around the mating surface of the carb to manifold and the manifold to head joints. Be careful not to spray into the carb intake because it will mislead you. If rpm changes during the spray test you have an intake leak. Hope I'm not being too basic here.....
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